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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第2期5卷 140-150页

作者： Lee, Heejung Lee, Geun-cheol koo, Hoon-Young Hanyang Univ Sch Interdisciplinary Ind Studies 222 Wangsimni Ro Seoul 04763 South Korea Konkuk Univ Coll Business Adm 120 Neungdong Ro Seoul 05029 South Korea Chungnam Natl Univ Sch Business 99 Daehak Ro Daejeon 34134 South Korea

Non-fungible token (NFT) is a digital asset whose ownership can be validated and controlled via blockchain technology. The NFT market is a rapidly growing field, and the rarity of NFT is an essential factor that affects its price, as scarcity leads to higher demand. This study focuses on the BAYC NFT collection, which is a successful and representative collection of profile picture NFT, and analyzes how rarity affects NFT prices. This paper investigates the relationship between the rarity and price of the BAYC NFT collection using formal concept analysis (FCA) method. The results show that rarity is a major factor influencing the price of NFT and the effect is more apparent in the medium rarity range. When rarity is very high or very low, other factors become significant determinants, such as the uniqueness and appeal of NFT, and even the naturalness of NFT images. This research highlights the importance of considering rarity when assessing NFT and underscores the need for a comprehensive evaluation of NFT rarity. This study also provides valuable insights into the NFT market and can be useful for NFT investors, creators, and collectors. Furthermore, the usefulness of FCA as a tool for quantifying NFT rarity and evaluating NFT price was demonstrated.

关键词： NFT valuation Formal concept analysis Rarity

Dosimetry of the Photo Neutron Produced in Medical Linear Accelerators

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Dosimetry of the Photo Neutron Produced in Medical Linear Ac...

Expression of E-cadherin and α-catenin in a varicocele-induced infertility rat model

The Second Asian and Oceanic Congress for Radiation Protection

作者： bon cheol koo Hong Suk KIM Jae-Seong LEE Chan Woo JEONG Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea

Currently, medical linear accelerators （LINACs） are the most common method of radiotherapy for tumor treatments and more than 90 LINACs are installed and operated in Korea in 2005. To increase the treatment efficiency, LINACs are trending toward higher energy（more than 15MV） nowadays. Meanwhile, the increased photon energy above about 8MV can produce undesired photo neutrons through photonuclear reaction between photon and surrounding materials in LINAC. In this study, the neutron generation and flux around the head geometry of a Varian Clinac 2100C LINAC has been simulated by a Monte Carlo calculation to evaluate photo neutron dose. Monte Carlo calculation using the MCNPX code has been performed for two different photons （generated from Varian 10MV, Varian 15MV） for three different field sizes （0ì 0 cm2, 10ì 10 cm2,20ì 20 cm2）. To compare with the calculation results, additional experimental measurements have been conducted by bubbledetectors on neutron dose and neutron energy spectrum.

关键词： Photo Neutrons Linear Accelerators Bubble Detectors

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Asian Journal of Andrology 2011年第3期13卷 470-475,514页

作者： Hong koo Ha Hyun Jun Park Nam cheol Park Department of Urology Pusan National University School of Medicine Busan 602739 Korea Medical Research Institute Pusan National University Hospital Busan 602739 Korea

The roles of E-cadherin and α-catenin were evaluated in the development of varicocele-induced infertility. Analysis of the association between the expression of E-cadherinla-catenin and clinical/pathological parameters was performed. Thirty lO-week-old male rats （experimental group） were used for the experiments; the left renal vein was ligated to form a varicocele. The abdomen was incised in 30 rats （control group） and no procedure was performed on 10 rats （baseline group）. The weights of the left testis, serum reactive oxygen species （ROS）, testosterone, luteinizing hormone （LH）, follicle-stimulating hormone （FSH） and degenerative changes in the seminiferous tubules after 4 and 8 weeks were recorded. The expression of E-cadherin and α-catenin was evaluated by immunohistochemical （IHC） staining and Western blot analysis. The ROS increased in the 8-week experimental group, compared with the baseline and control groups （P〈0.001 for both）. Additionally, FSH significantly increased in the 4- and 8-week experimental group compared with the control groups （P= 0.013 and P= 0.032, respectively）. The ratio of degenerative changes in the seminiferous tubules of the experimental groups increased. The IHC staining showed that the expression of E-cadherin and a-catenin decreased in the 4- and 8-week experimental groups. Similar to the IHC staining, the experimental group had decreased reactivity on Western blot analysis. The expression of E-cadherin and a-catenin was significantly associated with the ROS and degenerative changes in the seminiferous tubules. The results of this study suggest that damage to the blood-testis barrier （BTB） is associated with varicocele-induced male infertility, and that ROS may cause damage to the BTB.

关键词： α-catenin blood-testis barrier E-cadherin varicocele infertility

Restoration of an Inner-City Stream and Its Impact on Air Temperature and Humidity Based on Long-Term Monitoring Data

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Advances in Atmospheric Sciences 2009年第2期26卷 283-292页

作者： Kyu Rang KIM Tae Heon KWON Yeon-Hee KIM Hae-Jung koo Byoung-cheol CHOI Chee-Young CHOI Applied Meteorology Research Laboratory National Institute of Meteorological Research Korea Meteorological Administration Applied Meteorology Research Laboratory National Institute of Meteorological ResearchKorea Meteorological Administration

Spatiotemporal changes in air temperature and humidity associated with the restoration of an innercity stream in Seoul, Korea, are investigated based on long-term monitoring data. The Cheonggye stream, covered under a concrete structure for 46 years, was restored in 2005 and runs 5.8 km eastward through a central region of Seoul. Long-term monitoring of the air temperature and relative humidity was made along the stream throughout the restoration and across the stream after the restoration. The area along the stream had a higher air temperature than the entire metropolitan area. The temperature anomaly between the monitoring area and the surrounding metropolitan area was 0.13℃ lower on average at the center of the stream after the restoration. The stream＇s effect on the air temperature was also evident in the temperature distribution along a street traversing the stream. The relative and specific humidities were increased due to the restoration. The restored stream modified the nearby urban climate in the opposite direction compared to urbanization. The results could be used as a model case in mitigating urban climate by a stream in future urban planning practices.

关键词： urban heat island stream restoration land-use vegetation Cheonggye stream

Superior electrocatalytic negative electrode with tailored nitrogen functional group for vanadium redox flow battery

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Journal of Energy Chemistry 2023年第3期78卷 148-157,I0005页

作者： Min Gu Kang Wook Ahn Joonhee Kang Shin Ae Song Kiyoung Kim Ju Young Woo Yong-cheol Jeong bonwook koo Dae Soo Jung Sung Nam Lim Micro/Nano Scale Manufacturing Group Korea Institute of Industrial Technology143 HanggaulroSangrok-guAnsan-siGyeonggi-do 15588Republic of Korea Department of Energy Systems Engineering Soonchunhyang University22 Soonchunhyang-roShinchang-myeonAsan-siChungcheongnam-do 31538Republic of Korea Department of Nanoenergy Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Nano Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Energy Storage Materials Center Energy&Environmental DivisionKorea Institute of Ceramic Engineering&Technology(KICET)101 Soho-roJinju-siGyeongsangnam-doRepublic of Korea

Development of electrodes with high electrocatalytic activity and stability is essential for solving problems that still restrict the extensive application of vanadium redox flow batteries(VRFBs).Here,we designed a novel negative electrode with superior electrocatalytic activity by tailoring nitrogen functional groups,such as newly formed nitro and pyridinic-N transformed to pyridonic-N,from the prenitrogen-doped *** was experimentally confirmed that an electrode with pyridonic-N and nitro fuctional groups(tailored nitrogen-doped graphite felt,TNGF) has superior electrocatalytic acivity with enhanced electron and mass *** functional theory calulations demonstrated the pyridonic-N and nitro functional groups promoted the adsorption,charge transfer,and bond formation with the vanadium species,which is consistent with expermental *** addition,the V2+/V3+redox reaction mechanism on pyridonic-N and nitro functional groups was estabilised based on density functional theory(DFT) *** TNGF was applied to a VRFB,it enabled enhanced-electrolyte utilization and energy efficiencies(EE) of 57.9% and 64.6%,respectively,at a current density of 250 mA cm^(-2).These results are 18.6% and 8.9% higher than those of VRFB with electrode containing graphitic-N and pyridinicN ***,TNGF-based VRFB still operated with an EE of 59% at a high current density of300 mA cm^(-2).The TNGF-based VRFB exhibited stable cycling performance without noticeable decay of EE over 450 charge-discharge cycles at a current density of 250 mA cm^(-2).The results of this study suggest that introducing pyridonic-N and nitro groups on the electrode is effective for improving the electrochemical performance of VRFBs.

关键词： Tailored nitrogen functional group Pyridonic-N Nitro Negative electrode Density functional theory Vanadium redoxﬂow batteries

Pathology and molecular characterization of recent Leucocytozoon caulleryi cases in layer flocks

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The Journal of Biomedical Research 2016年第6期30卷 517-524页

作者： Hae Rim Lee bon-Sang koo Eun-Ok Jeon Moo-Sung Han Kyung-cheol Min Seung Baek Lee Yeonji Bae In-Pil Mo Avian Disease Laboratory College of Veterinary MedicineChungbuk National University Division of Basic Research Bureau of Ecological ResearchNational Institute of Ecology

Leucocytozoonosis was found in three layer farms in chickens with suspected fatty liver or fatty liver hemorrhagic syndrome in Korea between 2009 and *** layer chicken flocks showed both mortality and decreased egg production for one or two weeks when they were between 59 and 82 weeks *** the necropsy,the most prominent gross lesions were found in the liver,which was enlarged,had a fragile texture,exhibited yellowish discolorations,and had various hemorrhagic *** reactions associated with megaloschizonts specific for Leucocytozoon caulleryi were prominent upon microscopic examination of the liver without significant *** addition,the ovaries and uterus were the most affected organs for Leucocytozoon caulleryi multiplication,which led to decreased egg *** studies with formalin-fixed,paraffin-embedded tissues were performed in search of a partial region of the cytochrome b gene for hemosporidian *** on these results,the causal agent was determined to be closely related to Leucocytozoon caulleryi reported in Japan and *** this study,we describe recently re-occurring leucocytozoonosis in layer chickens,which required histopathology for disease *** prevent outbreaks and maintain chicken health and egg production,layer chickens need to be monitored for symptoms of leucocytozoonosis.

关键词： chicken leucocytozoonosis Leucocytozoon caulleryi layer chicken flocks histopathology megaloschizont

Pig Chromosome 6（SSC6） Differentially Expressed Genes between Korean Native Pig and Yorkshire breeds

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Pig Chromosome 6（SSC6） Differentially Expressed Genes betw...

Live Fibular Graft for the Treatment of Long bone Tumors in Children

第十五次全国动物遗传育种学术讨论会

作者： cheol-koo Lee Kwan-Suk Kim College of Life and Environmental Sciences Korea UniversitySeoulKorea Department of Animal Science Chungbuk National UniversityCheongjuKorea

＜正＞Introduction Loin muscle intramuscular fat（IMF） content is one of the most important parameters for determining the meat *** researches indicated that porcine chromosome 6（SSC6） probably hosts genes related ... 详细信息

关键词： SSC6 IMF Differentially Expressed Gene comparative map

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Journal of Cancer Therapy 2017年第3期8卷 225-233页

作者： Seung-koo Rhee Mohammed Einayet Abdelhameed Chi-Hoon Ahn cheol-U Kim Department of Orthopaedic Surgery Bone & Joint Tumor Division Daejeon Sun Medical Center Daejeon Korea Department of Orthopaedic Surgery Sharg Alneel Hospital Khartom Sudan

Purposes: We would like to inform the characteristics of recurred osteo-fibrous dysplasia (OFD), and also the possible use of vascularized composite autograft and allografts (VCA) combined with live fibular graft (LFG) for the treatment of aggressive benign bone tumor and osteogenic sarcomas in children. Materials and Methods: We reviewed one boy with recurred OFD after LFG, and other four children with osteogenic sarcoma in long bone which was treated with LFG and VCA, and followed them for average 9 years (3 - 14 years). Survival of the LFG and VCA was estimated by the ISOLS Functional Radiologic Scoring System, but not with Kaplans-Meier’s scoring system because of a small series of case reports. Results: All succeed after surgeries initially, but the cause of recurrence of OFD was still unclear, and one girl with osteogenic sarcoma on distal femur died with skip and lung metastasis, 4 years after surgeries. Conclusions: The causes of recurred OFD are not found thru pathologic studies of our patient, but we believe the multifocal origin of tumor cells even on the adjacent soft tissues in OFD is one of the causes. The excised long bone tumor is recycled by pasteurization or autoclaving, or allograft, then LFG, and neo-adjuvant chemotherapy would be one of elective surgery for the treatment of malignant long bone tumors in children. The LFG into recycled autograft or allograft bone is difficult to perform simultaneously, but very effective to increase more earlier regenerative vascularities and also the stabilities of the dead bones in children.

关键词： Live Fibular Graft Vascularized Composite Allograft or Autograft Osteofibrous Dysplasia Osteogenic Sarcoma Children

Diagnostic criteria for autoimmune chronic pancreatitis revisited

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World Journal of Gastroenterology 2006年第16期12卷 2487-2496页

作者： Kyu-Pyo Kim Myung-Hwan Kim Jong cheol Kim Sang Soo Lee Dong Wan Seo Sung koo Lee Department of Internal Medicine University of Ulsan College of MedicineAsan Medical CenterSeoulKorea

Autoimmune chronic pancreatitis （AIP） is increasingly being recognized worldwidely, as knowledge of this entity builds up. Above all, AIP is a very attractive disease to clinicians in terms of its dramatic response to the oral steroid therapy in contrast to ordinary chronic pancreatitis. Although many characteristic findings of AIP have been described, definite diagnostic criteria have not been fully established. In the year 2002, the Japan Pancreas Society published the diagnostic criteria of AIP and many clinicians around the world use these criteria for the diagnosis of AIP. The diagnostic criteria proposed by the Japan Pancreas Society, however, are not completely satisfactory and some groups use their own criteria in reporting AIP. This review discusses several potential limitations of current diagnostic criteria for this increasingly recognized condition. The manuscript is organized to emphasize the need for convening a consensus to develop improved diagnostic criteria.

关键词： Autoimmune chronic pancreatitis Diagnostic criteria

Optimal design of rotor slot of three phase induction motor with die-cast copper rotor cage

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Optimal design of rotor slot of three phase induction motor ...